By Bryan Calandrelli, Niagara Escarpment Correspondent When Lenn asked me to write about the five most exciting wines of 2008 from the Niagara region, I assumed that I could rattle them off in a heartbeat. But when I really sat down to put my list together, I realized something; it takes a lot these days to really get me going – at least when it comes to wine. In established wine regions, I usually reserve my excitement for estate-grown wines or hard-to-find varietals. In Niagara wine country, however, things are a bit different. For one, we’re still in the pioneer…